Certified translation
Each foreign-language document needs full English text plus a signed statement that the translator is competent and the translation accurate. Notarization is not required.
Where official language help already exists
USCIS builds some multilingual access into its own services.
The USCIS contact center offers assistance in Spanish and can connect interpreters for many other languages, and the myUSCIS site includes a Spanish version. Forms themselves must be filed in English, but USCIS publishes alerts and many guides in multiple languages. Any document you submit in a foreign language needs a complete English translation with the translator's signed certification of competence. That certification does not require a special licence; a competent bilingual person may sign it, though professional translators reduce the risk of costly errors.
Spanish USCIS tools
The USCIS website and contact center provide Spanish versions of major resources, and interpreters cover many additional languages on request during calls.
Bring your own interpreter, not your own risk
Community help is valuable when you control who sees your papers.
If a friend or family member interprets, keep the rule about documents: they see your file because you trust them, not because a website demanded it. At interviews, USCIS may allow you to bring an interpreter, though some appointments provide one; check your notice. Community organizations on the DOJ recognition list frequently serve specific language groups, which pairs translation with authorized advice. Avoid the bilingual fixer who keeps your originals, answers questions without translating them to you, or discourages you from reading the English version of anything you sign.